Image Acquisition Control
86 Basler pilot
You should adjust the exposure setting to represent the shortest exposure time you intend to use.
For example, assume that you will be using trigger width exposure and that you intend to use the
ExTrig signal to vary the exposure time in a range from 3000 µs to 5500 µs. In this case you would
use the exposure setting to set the exposure time to 3000 µs.
If you are using the trigger width exposure mode and the camera is operating with overlapped
exposures, there is something you must keep in mind. If the action of the ExTrig signal would end
the current exposure while readout of the previously acquired image is still taking place, the camera
will automatically continue the exposure until readout of the previous image is complete. This
situation is illustrated Figure 31 for rising edge operation. On the first cycle of the ExTrig signal
shown in the figure, the signal rises and falls while readout is taking place. Normally you would
expect exposure to take place only when the ExTrig signal is high. But since the signal falls while
the previous frame is still reading out, the camera automatically extends exposure until the readout
is complete. On the second cycle of the ExTrig signal shown in the figure, the signal rises during
previous frame readout, but falls after the readout is complete. This is a normal situation and
exposure would be determined by the high time of the ExTrig signal as you would expect.
Fig. 33: Trigger Width Exposure Mode with Overlapped Exposure
You can set the exposure time parameter value and select an exposure mode from within your
application software by using the pylon API. The following code snippets illustrate using the API to
set the exposure time parameter and select the exposure mode:
// set for the timed exposure mode, set exposure time to 3000 µs
Camera.ExposureMode.SetValue( ExposureMode_Timed );
Camera.ExposureTimeAbs.SetValue( 3000 );
// set for the width exposure mode, set minimum exposure time to 3000 µs
Camera.ExposureMode.SetValue( ExposureMode_TriggerWidth );
Camera.ExposureTimeAbs.SetValue( 3000 );
For detailed information about using the pylon API, refer to the Basler pylon Programmer’s Guide
and API Reference.
You can also use the Basler pylon Viewer application to easily set the parameters.
For more information about the pylon viewer, see Section 3.1 on page 29.
For more information about the camera’s exposure time parameter, see Section 8.4 on page 91.
For more information about overlapped exposure, see Section 8.5 on page 94.
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